#include <iostream>
#include <queue>
#include <map>
#include <unordered_map>
#include <vector>
#include <algorithm>
#include <cmath>
#include <string>
#include <cstring>
#include <set>
#include <unordered_set>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> pii;
int main()
{
	int t;
	cin>>t;
	while(t--)
	{
		ll a,b;
		cin>>a>>b;
		ll cnt=0;
		ll sum=0;
		while(sum<=b)
		{
			sum=sum*10+9;
			cnt++;
		}
		cnt--;
		cout<<a*cnt<<endl;
	}

	return 0;
}

